98 
Fishery Bulletin 107(1 ) 
Narragansett Bay 
Long Island Sound 
CD 
o 
c 
2 
03 
(D 
Q. 
Q. 
03 
00 
O 
0 
0 
§ 
Temperature on 1 June (°C) 
0 
o 
c 
CO 
CO 
0 
CL 
CL 
03 
Maximum temperature (°C) 
0 
0 
C 
CO 
CO 
0 
Q. 
CL 
03 
00 
CD 
Temperature on 1 October (°C) 
Figure 7 
Correlations between temperatures and weeks of the year (1-52) of first (5% of peak), last, and peak 
appearance of warm-water fishes in both Narragansett Bay and Long Island Sound (1987-2000). 
in both locations. In regard to their fall disappearance, 
warm-water fishes may experience different fates after 
seasonal periods in temperate estuaries. For some spe- 
cies, eastern Atlantic Ocean populations exist, raising 
the possibility that dispersal can range across the At- 
lantic Ocean (Markle et al., 1980), which is especially 
a possibility for species that are strong swimmers, such 
as the carangids (McBride and McKown, 2000). How- 
ever, it is believed that most warm-water species do not 
successfully return to their place of origin, but die off 
as waters cool to temperatures below their physiological 
tolerances in the fall months. Moss (1973) conducted a 
series of experiments with planehead filefish and found 
that their lowest lethal temperature limit was 5.6°C, 
